/Engine/Source/Runtime/Engine/Public/Animation/AnimInstanceProxy.h
CallsUpdate(), updates the anim graph from the specified root, ticks asset players
void UpdateAnimation_WithRoot ( const [FAnimationUpdateContext](API\Runtime\Engine\Animation\FAnimationUpdateContext) & InContext, [FAnimNode_Base](API\Runtime\Engine\Animation\FAnimNode_Base) * InRootNode, [FName](API\Runtime\Core\UObject\FName) InLayerName )